it's a tight race in key battleground states and that has many republicans calling for romney go on offense, when he takes the stage on wednesday in denver. we begin america's news headquarters with carl cameron. we understand that romney is prepare for example wednesday's debate. any word on when we can expect. >> reporter: he's been preparing, arguably for seven years or more, but very, very aggressive in the last few months. he will go mind the doors and do additional rehearsing, talking with the staff about how to do this. the evolution has changed a little bit. he has been doing a lot of mock debates with ohio senator rob portman, thrs but there is a long-standing process where he does q&a with his staff, trying to hone the rhetoric. the truth of the matter is, as handicap ors both sides of the aisle watch, have you the folks from the president obama trying to lower his expectations and the romney camp trying to lower the idea of a break-out moment f. you can get him to expect him to mediocre and he does reasonable, he will come out. but one-liners and zingers are not what changes mine